package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.JwtClaimsConstant;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.JwtProperties;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.JwtUtil;
import com.sky.vo.UserLoginVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private JwtProperties jwtProperties;
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 实现微信登录功能
     *
     * @param loginDTO
     * @return
     */
    @Override
    public UserLoginVO wxLogin(UserLoginDTO loginDTO) {
        User user = getUserLogin(loginDTO);
        Long userId = user.getId();

        Map<String, Object> claims = new HashMap<>();
        claims.put(JwtClaimsConstant.USER_ID, userId);
        String jwtToken = JwtUtil.createJWT(jwtProperties.getUserSecretKey(), jwtProperties.getUserTtl(), claims);
        UserLoginVO userLoginVO = UserLoginVO.builder()
                .id(user.getId())
                .openid(user.getOpenid())
                .token(jwtToken)
                .build();
        return userLoginVO;
    }

    private User getUserLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO);

        //判断是否为空
        if (openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否为新用户
        User user = userMapper.getByUserId(openid);
        if (user==null){
            //创建一个新的user对象出来
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        return user;
    }

    private String getOpenid(UserLoginDTO userLoginDTO) {
        //调用weixin接口服务,得到openid
        Map<String,String> map= new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type","authorization_code");

        String jsonStr = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSONObject.parseObject(jsonStr);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
